Can I Mix MySQL's `mysql_` and `mysqli_` APIs in PHP?

Mixing MySQL APIs in PHP: A Cautionary Note

Despite the suggestion that it's possible to mix mysql_ and mysqli_ APIs in PHP, it's crucial to understand that this practice is not recommended. MySQL has two sets of APIs: the legacy mysql_ functions and the improved mysqli_ functions. Mixing the two APIs can lead to runtime errors and unexpected behavior.

In the provided code, you attempt to create a connection with mysqli_connect() and close it with mysql_close(). This combination is incompatible. You should either use mysqli_connect() and mysqli_close() or mysql_connect() and mysql_close() consistently throughout your code.

Alternatively, if you want to validate a connection, you should use the correct API-specific close function. For mysqli_connect(), use mysqli_close(), and for mysql_connect(), use mysql_close().

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